William Kahan, winner of the Association for Computing Machinery's A.M. Turing Award, describes his work as a consultant to HP on its celebrated line of programmable calculators, particularly his work to squeeze highly efficient solve, integrate, and matrix functions into their severely limited hardware capabilities. This clip is taken from an interview conducted with Kahan by Thomas Haigh for the ACM on 12 March, 2016 in Berkeley, California. Video of the full interview is available as part of Kahan’s ACM profile at https://amturing.acm.org/award_winner....